Not that there’s anything wrong with that: In 1992’s fourth season, political correctness was strong. In one episode, a reporter speculated that Jerry and George might be gay. Both denied it, but added, “Not that there’s anything wrong with that.”

Soup Nazi: In the seventh season, “Seinfeld” made the “Soup Nazi” a well-known character and his signature phrase, “No soup for you!” The friends frequented a restaurant with delectable soups but a grumpy owner who would send patrons packing who did not order correctly with an angry, “No soup for you!”